• Quick Specifications: Push/Pull Zoom, Manual Focus, Minimum Focus Distance: 5.25 feet (1.6m), Aperture -16, Filter Size 62mm, 2 Group 4 Elements Multi-Coated Glass Optics, Rotating Tripod Mount • IMPROVED EDITION: The improved Opteka 420-800mm lens features multi-coated glass optics for clearer images. The four elements in the two groups are digitally optimized to provide the best possible image without breaking the bank. It also adds a built-in rotating tripod mount to stabilize the lens especially when using a 2x converter which increases the zoom to an incredible 1600mm • Advanced Optics: Featuring an optimized design, this lens uses a series of four optical glass elements in a mirror and two groups to reduce chromatic aberration and spherical aberration. Anti-reflective coating inhibits lens flare and ghosting for increased contrast and color fidelity • SUPER ZOOM: Manual Focus 420-800mm or 840-1600mm 2x Converter This lens is not only a long-range choice but also a great choice for sports and surveillance to daily shooting • STURDY CONSTRUCTION: All metal yet lightweight body and rear mount make this lens far more resistant to wear and tear than plastic lenses. Rugged and solid feel for indoor and outdoor use